While rechambering for .32 centerfire will work out better in the long run, there are reloading kits for .32 rimfire available. They involve using special brass that have a hole on the edge of the case for .22 blanks to be pressed in. This means you have to carefully position the case so that the hammer will hit that spot where the blank primer is, but it does work.
They're not cheap, but they're interesting and allow you to keep the rifles in their original chambering.
http://www.hlebooks.com/32rfkit/prices.htm
Here's a video on the loading process:
https://www.youtube.com/watch?v=jIxXqZ7XNIk